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JSON Null Prune
x402
JSON Null Prune is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Removes all null-valued top-level keys from a JSON object and returns the pruned object with counts and a versioned result contract
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Null Prune: JSON Null Prune removes null-valued top-level keys from a JSON object from bounded caller-supplied values without an external provider. Call JSON Null Prune before an agent hands structured data or a batch plan to a downstream tool with a stricter contract. Returns the bounded transformation or validation finding with counts, normalized values, and a versioned result contract for JSON Null Prune as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party,…
Output
Returns a versioned deterministic JSON object containing the pruned input object (all null top-level keys removed), a count of keys removed, a count of keys retained, and normalized values — all within a versioned result contract envelope.
Example use cases
Sanitize agent output before downstream tool
“Before sending this batch plan JSON to the fulfillment API, strip out any top-level keys that are null — I don't want schema validation errors on their end.”
Clean API response before storage
“I've got a JSON object from the data enrichment step and some fields came back null. Can you prune those null top-level keys out so the clean version is what gets stored?”
Prepare structured data for strict contract
“This agent result has a bunch of null fields at the top level that will fail the downstream validator. Remove all the null-valued top-level keys and tell me how many were dropped.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-null-pruneWhen to prefer
Use this endpoint when an agent needs to clean a JSON object of null top-level keys before passing it to a downstream tool with a strict or null-intolerant schema contract. Prefer it over manual filtering logic when you need a versioned, auditable, deterministic result with key counts. It is lightweight ($0.001 USDC), in-memory with no retention, and purpose-built for agentic pipeline hygiene.
Side effects
- Input object exceeds 128 top-level properties — rejected with validation error
- Input is not a valid JSON object (e.g. array or primitive) — returns schema error
- Network or payment failure via x402 protocol — returns HTTP 402 or connection error
- Empty object input — returns empty pruned object with zero counts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| object | object | Object supplied to JSON Null Prune; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"object": {
"a": 1,
"c": 0
},
"removed_keys": [
"b"
]
},
"schema": "delx/util-json-null-prune/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "87c8df8571467e64e55b273ef3bf9c2fffef2d81ad0cab8581f5a7d7a6236c39",
"external_calls": 0
},
"operation": "data_batch:json_null_prune"
}
}Tags
x402
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